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  3. American universities are rushing towards a wireless future. They are installing networks that let students and teachers surf th

American universities are rushing towards a wireless future. They are installing networks that let students and teachers surf th

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问题     American universities are rushing towards a wireless future. They are installing networks that let students and teachers surf the Internet from laptop computers(笔记本电脑). But professors say the technology poses a growing【C1】______: Retaining their students’ attention.
    In a classroom at American University in Washington D.C., the benefits and【C2】______of the new wireless work were on display. From the back row of a lecture hall, more than a dozen laptop screens were【C3】______. As Professor Jay Mallek lectured on the finer points of an office budget, many students went online to surf the Internet. Students write quick e-mails and send instant messages. A young man shows an amusing e-mail to the women next to him, and then switches over to read the online edition of The Wall Street Journal. Distraction is nothing【C4】______. As long as there have been schools, students have whispered, passed notes and even gazed out the window and daydreamed. But the【C5】______of the laptop has introduced new opportunities for distraction, and wireless introduces an even【C6】______range of distraction.
    This is【C7】______annoying for law professors, many of whom still live in the world of paper. "This is something that hurts the students themselves," said Ian Ayres, professor at Yale Law School, who【C8】______the Internet’s entry into the classroom. However, Professor Mallek sees it【C9】______. He said the benefits of the technology outweigh(胜过)the problems. He suggested that it might even be making him a better teacher. He takes the【C10】______of losing his students to e-mail and online newspapers as a challenge to keep lectures lively and interesting.
A)visible I)new
B)threat J)demonstrates
C)possible K)larger
D)opposes L)differently
E)obstacle M)challenge
F)especially N)arrival
G)broader O)advantages
H)drawbacks
【C1】
选项
答案M
解析 根据空前的a growing…可判断此处应填名词，可选的词有B)threat、E)obstacle、H)drawbacks、M)challenge、N)arrival和O)advantages。文章第二段提到学生在课堂上利用无线网络上网、收发邮件等，这在很大程度上分散了学生的课堂注意力，由此可知，在这种情况下对于教授们要抓住学生的注意力来说是一项巨大的挑战，而不是障碍，故答案为M)challenge。
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